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系統識別號 U0026-2408201215233600
論文名稱(中文) 七家灣溪壩體移除對河相演變之探討
論文名稱(英文) Geomorphic Responses Associated with Dam Removal on Chijiawan Creek
校院名稱 成功大學
系所名稱(中) 水利及海洋工程學系碩博士班
系所名稱(英) Department of Hydraulics & Ocean Engineering
學年度 100
學期 2
出版年 101
研究生(中文) 張家豪
研究生(英文) Chia-Hao Chang
學號 N86991029
學位類別 碩士
語文別 中文
論文頁數 69頁
口試委員 指導教授-王筱雯
口試委員-卡艾瑋
口試委員-孫建平
中文關鍵字 壩體移除  河相演變模式  七家灣溪 
英文關鍵字 dam removal  channel evolution model  CEM  Chijiawan Creek 
學科別分類
中文摘要 壩體移除為近年來河川復育的重要手段之一,然而由於相關經驗仍較有限,因此也因此獲得各界重視,而雪霸國家公園為了復育台灣國寶魚-櫻花鉤吻鮭棲地的連貫性,針對七家灣溪一號防砂壩進行壩體移除。
本研究以台中市和平區七家灣溪流域為研究區域,以七家灣溪一號防砂壩壩體移除工程為例子,然而壩體移除後,後續為物理棲地所帶來的變動乃交錯複雜,故在壩體移除前後進行斷面調查、粒徑分析及棲地繪製,並蒐集歷年來的水文資料及現地實測資料,以探討壩體移除後泥砂對河道所造成之影響。
由斷面結果得知,在壩體移除一個月後,隨即受到米雷颱風的影響,造成上游大量泥砂被帶至下游產生淤積,而上游溯源侵蝕段約沖刷至上游200公尺。在洪水發生後河道形狀也依序產生縱向侵蝕、側向侵蝕及側向淤積,且泥砂粒徑受洪水影響改變非常明顯。本研究並進一步利用斷面量測結果加上現地影像拍攝,紀錄不同時期河相的變化,並套用到河相演變模式,利用河道的形狀及泥砂的沖刷情形,定義出壩體移除後六個階段的河相情形,其中第一階段為壩體移除前,第二階段為壩體移除後水面急速下降,第三階段泥砂開始侵蝕,且開始造成渠道集中的情形,第四階段渠道持續加深且加深,第五階段因寬度到達臨界點,輸砂能力下降造成底床逐漸回淤,到了第六階段,長出植生到達準平衡的階段。
本研究所建立之七家灣溪拆壩後河相演變模式可作為於未來國內其他壩體改善後河相變化之參考依據。
英文摘要 Dam removal has been one of the most important measures of river restoration in recent years. In order to restore the habitat of Formosan Landlocked Salmon, the Shei-Pa National Park removed the Dam No.1 in Chijiawan Creek in June, 2011.
Chijiawan Creek is located in Heping District of Taichung City. This study conducted field surveys on cross-sections, longitudinal profiles, sediment size, and habitat mapping both before and after the dam removal. Based on the field data analysis and the collection of hydrological data, the study was aiming at documenting the channel responses after dam removal and understanding the evolution better.
From the results of cross-sections, discharge induced by the typhoon Meari a month later after dam removal transported large amounts of sediment from the impoundment area. Headcut was migrating up to 200m upstream. Together with longitudinal erosion upstream and deposition downstream, the channel also experienced lateral erosion and deposition. Furthermore, this study established a conceptual model of channel evolution based on the surveyed data and taken photos on site. The established model showed that the channel is still adjusting over coming months and years.
The findings of this study can serve as a solid reference for future dam removal projects in Taiwan.
論文目次 摘要 I
Abstract II
誌謝 III
目錄 IV
表目錄 VI
圖目錄 VII
第一章緒論 1
1-1前言 1
1-2研究動機與目的 2
1-3論文架構 2
第二章文獻回顧 3
2-1壩體移除對河相的影響 3
2-2國內外案例 8
第三章研究方法 16
3-1研究區域 16
3-1-1地文資料 16
3-1-2 水文資料 16
3-1-3七家灣溪一號壩 17
3-2影像分析 18
3-2-1衛星影像 18
3-2-2定點攝影 20
3-3河相分析 22
3-3-1 斷面調查 22
3-3-2土方量計算 24
3-3-3粒徑採樣 26
3-3-4河道演變模式(Channel Evolution Model) 28
3-4棲地繪製 28
第四章結果分析與討論 30
4-1斷面調查結果 30
4-1-1縱斷面 31
4-1-2壩上游斷面 33
4-1-3壩下游斷面 37
4-1-4土方量計算 39
4-2粒徑採樣結果 42
4-2-1明坑採樣 42
4-2-2表面粒徑 43
4-2-3粒徑結果比較 46
4-3河相分析結果 48
4-3-1航照圖分析 48
4-3-2上游河道演變模式 50
4-3-3下游河道演變模式 56
第五章結論與建議 64
5-1結論 64
5-2 建議 65
參考文獻 66
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